leave no stone unturnedto do everything you can in order to find something or to solve a problem 千方百计，想尽一切办法 Jarvis left no stone unturned in his search to find the ring. 贾维斯千方百计寻找那枚戒指。
leave no stone unturned• If a solution can be found, Mr Danby, I shall leave no stone unturned until I have found it.• Union leaders have promised to leave no stone unturned in their search for a way to keep the factory open.• Henry was a boy who left no stone unturned, and he got a torch and shone the beam inside.
→ leave no stone unturned at stone1(4)